P1598

Tests 1 - 3:

Tests 4 - 7:

SYMPTOM
P1598 - A/C PRESSURE SENSOR VOLTS TOO HIGH

WHEN MONITORED
With the ignition in, the engine running, and the A/C relay energized.

SET CONDITION
The A/C pressure sensor signal at the PCM goes above 4.9 volts.

POSSIBLE CAUSES
- Intermittent wiring & connectors conditions
- A/C pressure sensor ground circuit open
- A/C pressure sensor signal circuit open
- A/C pressure sensor signal circuit shorted to voltage
- A/C pressure sensor (voltage < 1.0 volt)
- Powertrain control module